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Arfvedsonite Fergusonite & Smoky Quartz On Orthoclase

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SLN633987

Arfvedsonite Fergusonite & Smoky Quartz On Orthoclase

Description Tabs

Description
Locality: 
Mount Malosa, Zomba, Southern Region, Malawi
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
2.6 × 6.3 × 3.2 cm
Weight: 
55.00gr
Description

Nice specimen from Malawi with an interesting association of arfvedsonite in perfect crystals of excellent brightness,  fergusonite in prismatic and elongated nut-brown crystals ans smoky quartz on matrix of creamy white crystallized ortochlase.

Mineral Data
What's on the rock

Arfvedsonite

Formula: 
[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Strunz: 
9.DE.25
Hardness: 
5.0 - 6.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

Fergusonite

Synonym Of: 

Fergusonite-(Ce)

Formula: 
(Ce,La,Nd)NbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5

Fergusonite-(Y)

Formula: 
YNbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5

Smoky Quartz

Variety Of: 

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Hardness: 
7.0
Formula: 
SiO2
Hardness: 
0.0

Orthoclase

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Hardness: 
6.0
Streak: 
White

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